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Last Updated: 2026-08-27 08:57:35

Use serial debug on Ubuntu

There are many options available on Ubuntu:

  • minicom
  • picocom
  • kermit

The following shows how to use minicom.

Install minicom

sudo apt-get install minicom

To connect the serial port line, see what the serial port device file is. The following example is /dev/ttyusb0:

$ ls /dev/ttyUSB*
/dev/ttyUSB0

Run:

$ sudo minicom
Welcome to minicom 2.7
OPTIONS: I18n
Compiled on Jan  1 2014, 17:13:19.
Port /dev/ttyUSB0, 15:57:00
Press CTRL-A Z for help on special keys

Based on the above tips: Press Ctrl-a and then press Z again to bring up the help menu.

+--------------------------------------------------------------------+
                        Minicom Command Summary                      |
|                                                                    |
|              Commands can be called by CTRL-A <key>                |
|                                                                    |
|               Main Functions                  Other Functions      |
| Dialing directory..D  run script (Go)....G | Clear Screen.......C  |
| Send files.........S  Receive files......R | cOnfigure Minicom..O  |
| comm Parameters....P  Add linefeed.......A | Suspend minicom....J  |
| Capture on/off.....L  Hangup.............H | eXit and reset.....X  |
| send break.........F  initialize Modem...M | Quit with no reset.Q  |
| Terminal settings..T  run Kermit.........K | Cursor key mode....I  |
| lineWrap on/off....W  local Echo on/off..E | Help screen........Z  |
| Paste file.........Y  Timestamp toggle...N | scroll Back........B  |
| Add Carriage Ret...U                                               |
|                                                                    |
|             Select function or press Enter for none.               |
+--------------------------------------------------------------------+

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